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It is well known that in the initial energy spectra of hydrocarbon fragment ions formed by electron impact, satellite ion groups occur which are believed to be mainly due to the fragmentation of doubly charged ions into two singly charged fragments. By using an electron energy of 150 eV a new type of satellite was observed in the initial energy spectra of C 1 H k  +  and C 2 Hl +  fragment ions from hydrocarbons with three and more carbon atoms. The n-paraffins were investigated systematically up to n-decane. Because the initial energy of these satellites is nearly twice the initial energy of the already well known “first” satellites, it is suggested that these newly discovered “second” satellites are due to an analogous fragmentation process of the type

zeitschrift für naturforschung a

Die kinetische Energie ionisierter Molekülfragmente: VI. Einfach- und doppeltgeladene Ionen hoher Anfangsenergie in den Bruchstückspektren von Kohlenwasserstoffen